The longest America's Cup in history will come down to two 72-foot, space-age catamarans making a final, dramatic sprint around San Francisco Bay, on a five-leg course framed by the Golden Gate Bridge and Alcatraz Island. Skipper Jimmy Spithill and defending champion Oracle Team USA, with Sir Ben Ainslie on board, saw to that by extending their almost unimaginable winning streak to seven on Tuesday to force a winner-take-all finale against Emirates Team New Zealand.Picture: Josh Edelson/AFP/Getty Images